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MonitorXrandr: resize the framebuffer prior to setting the CRTC configuration

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Otherwise X11 will trim the new configuration and disable outputs
outside the screen.

https://bugzilla.gnome.org/show_bug.cgi?id=705670
This commit is contained in:
Giovanni Campagna 2013-08-16 17:39:07 +02:00 committed by Giovanni Campagna
parent 39aecd2dde
commit 13557b39d0
1 changed files with 38 additions and 0 deletions
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38
src/core/monitor-xrandr.c
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@ -44,6 +44,11 @@
#define ALL_WL_TRANSFORMS ((1 << (WL_OUTPUT_TRANSFORM_FLIPPED_270 + 1)) - 1)
/* Look for DPI_FALLBACK in:
* http://git.gnome.org/browse/gnome-settings-daemon/tree/plugins/xsettings/gsd-xsettings-manager.c
* for the reasoning */
#define DPI_FALLBACK 96.0
struct _MetaMonitorManagerXrandr
{
MetaMonitorManager parent_instance;
@ -651,9 +656,42 @@ meta_monitor_manager_xrandr_apply_configuration (MetaMonitorManager *manager,
{
MetaMonitorManagerXrandr *manager_xrandr = META_MONITOR_MANAGER_XRANDR (manager);
unsigned i;
int width, height, width_mm, height_mm;
meta_display_grab (meta_get_display ());
width = 0; height = 0;
for (i = 0; i < n_crtcs; i++)
{
MetaCRTCInfo *crtc_info = crtcs[i];
if (crtc_info->mode == NULL)
continue;
if (meta_monitor_transform_is_rotated (crtc_info->transform))
{
width = MAX (width, crtc_info->x + crtc_info->mode->height);
height = MAX (height, crtc_info->y + crtc_info->mode->width);
}
else
{
width = MAX (width, crtc_info->x + crtc_info->mode->width);
height = MAX (height, crtc_info->y + crtc_info->mode->height);
}
}
g_assert (width > 0 && height > 0);
/* The 'physical size' of an X screen is meaningless if that screen
* can consist of many monitors. So just pick a size that make the
* dpi 96.
*
* Firefox and Evince apparently believe what X tells them.
*/
width_mm = (width / DPI_FALLBACK) * 25.4 + 0.5;
height_mm = (height / DPI_FALLBACK) * 25.4 + 0.5;
XRRSetScreenSize (manager_xrandr->xdisplay, DefaultRootWindow (manager_xrandr->xdisplay),
width, height, width_mm, height_mm);
for (i = 0; i < n_crtcs; i++)
{
MetaCRTCInfo *crtc_info = crtcs[i];